CVE-2025-12543Proof of concept (PoC) published · CISA

Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf

CVSS score

9.6

EPSS probability

%1.3

Risk score

0.1

Published

9 mo ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach CVE AI Research

CVE-2025-12543 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal network scans, or hijack user sessions.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2025-12543 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Red Hat	Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11	View
2	Red Hat	Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7	View
3	Red Hat	Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7	View
4	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4.24	View
5	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7	View
6	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7	View
7	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8	View
8	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8	View
9	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9	View
10	Red Hat	Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9	View
11	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0	View
12	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8	View
13	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8	View
14	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8	View
15	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8	View
16	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8	View
17	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8	View
18	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9	View
19	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9	View
20	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9	View
21	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9	View
22	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9	View
23	Red Hat	Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9	View
24	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1.3	View
25	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
26	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
27	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
28	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
29	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
30	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
31	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
32	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
33	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
34	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
35	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
36	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	View
37	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
38	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
39	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
40	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
41	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
42	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
43	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
44	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
45	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
46	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
47	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
48	Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	View
49	Red Hat	Red Hat Single Sign-On 7.6.13	View
50	Red Hat	Red Hat Single Sign-On 7.6 for RHEL 7	View
51	Red Hat	Red Hat Single Sign-On 7.6 for RHEL 8	View
52	Red Hat	Red Hat Single Sign-On 7.6 for RHEL 9	View
53	Red Hat	RHEL-8 based Middleware Containers	View
54	Red Hat	Red Hat build of Apache Camel - HawtIO 4	View
55	Red Hat	Red Hat Data Grid 8	View
56	Red Hat	Red Hat Enterprise Linux 10	View
57	Red Hat	Red Hat Enterprise Linux 8	View
58	Red Hat	Red Hat Enterprise Linux 9	View
59	Red Hat	Red Hat Fuse 7	View
60	Red Hat	Red Hat JBoss Enterprise Application Platform 7	View
61	Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	View
62	Red Hat	Red Hat Process Automation 7	View
63	redhat	build of apache camel	View
64	redhat	data grid	View
65	redhat	fuse	View
66	redhat	jboss enterprise application platform	View
67	redhat	jboss enterprise application platform	View
68	redhat	jboss enterprise application platform	View
69	redhat	jboss enterprise application platform	View
70	redhat	jboss enterprise application platform expansion pack	View
71	redhat	process automation	View
72	redhat	single sign-on	View
73	redhat	undertow	View
74	redhat	undertow	View

Total affected vendors: 2|Products: 74

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
9.6	CVSS V31	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L	NVD
9.6	CVSS V31	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	NVD
9.6	CVSS V3_1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L	CVE CNA
9.6	CVSS V3_1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L	CVE ADP

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-12543 is associated with the following CWEs:

CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-12543 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekiyor

Official Sources and Advisories

RHSA-2026:0383vendor-advisory RHSA-2026:0384vendor-advisory RHSA-2026:0386vendor-advisory RHSA-2026:33371vendor-advisory RHSA-2026:33372vendor-advisory RHSA-2026:3889vendor-advisory RHSA-2026:3890vendor-advisory RHSA-2026:3891vendor-advisory RHSA-2026:3892vendor-advisory RHSA-2026:4915vendor-advisory

CVSS Vector Radar Chart

9.6 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User Interaction—

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)High

Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

Red Hat

redhat

Weakness Type (CWE & CAPEC)

CWE-20

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